Hardware driving circuit of multi-segment LCD liquid crystal screen

Abstract

The invention discloses a hardware driving circuit of a multi-segment LCD liquid crystal screen, and belongs to the technical field of liquid crystal display. The drive circuit is mainly composed of an LCD drive-COM module, an LCD drive-SEG module, a backlight drive module and a master control single-chip microcomputer module, and all the modules are connected with a liquid crystal screen through FPC terminals. The I / O resources of the single chip microcomputer for driving the liquid crystal screen are not limited; the same circuit can be used for driving according to different screens, and single-chip microcomputers with different pins are matched, so that the resource use of the single-chip microcomputers is more flexible; the limitation that only a single-chip microcomputer with an LCD driving function can be used can be eliminated; the single-chip microcomputer is more free, and the single-chip microcomputer with more functional peripherals can be used; control is more accurate, and particularly, a multi-section liquid crystal screen is driven, so that a display driving algorithm is simpler and more convenient than that of a plurality of single-chip microcomputers; the driving voltage of the SEG and the COM can be changed through a peripheral circuit.

Description

Technical Field

[0001] The present invention belongs to the technical field of liquid crystal display, and particularly relates to a hardware drive circuit for a multi-segment LCD liquid crystal screen. Background Art

[0002] With the continuous update of display devices, various display methods have gradually become popular. The VA screen is a display material that can use the rotation of liquid crystals to adjust the light transmission by changing the amount of LED backlight passing through. Currently, most VA liquid crystal screens are driven by a single-chip microcomputer with LCD driving functions, and the working state of the screen is controlled through special pins. When a single-chip microcomputer with LCD driving functions drives the screen, there is a problem that the resources of the single-chip microcomputer are not enough to drive all the liquid crystal segments of the screen, and multiple single-chip microcomputers need to be controlled simultaneously. Due to the differences between each single-chip microcomputer, there are potential risks of display delay or out-of-sync, affecting the stability of the entire display system.

[0003] Moreover, it is necessary to use a single-chip microcomputer with LCD driving, which limits the diversity of single-chip microcomputer selection and occupies the use of other functions such as serial ports. Summary of the Invention

[0004] In view of the above technical problems existing in the prior art, the present invention proposes a hardware drive circuit for a multi-segment LCD liquid crystal screen, which is reasonably designed, overcomes the deficiencies of the prior art, and has good effects.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] A hardware drive circuit for a multi-segment LCD liquid crystal screen, comprising:

[0007] A main control single-chip microcomputer module, configured to output SEG signals and COM signals for driving the LCD liquid crystal screen;

[0008] An LCD drive-COM module, connected to the I / O port of the main control single-chip microcomputer module, configured to convert the COM signal output by the single-chip microcomputer into a COM segment voltage required for driving the LCD liquid crystal screen through resistors, capacitors, and MOS transistors, and output it to the COM terminal of the liquid crystal screen;

[0009] An LCD drive-SEG module, connected to the I / O port of the main control single-chip microcomputer module, configured to convert the SEG signal output by the single-chip microcomputer into a SEG segment voltage required for driving the LCD liquid crystal screen through resistors and capacitors, and output it to the SEG terminal of the liquid crystal screen;

[0010] A backlight drive module, providing backlight power for the LCD liquid crystal screen;

[0011] Among them, the LCD driving - COM module and the SEG driving module generate the voltage difference required for the LCD liquid crystal screen through their respective voltage - dividing circuits, and control the rotation of the LCD liquid crystal screen to achieve display.

[0012] Preferably, the LCD driving - COM module includes:

[0013] A complementary square - wave generating circuit, configured to receive a complementary square - wave signal from the main control single - chip microcomputer module;

[0014] A first voltage - dividing circuit, connected to the complementary square - wave generating circuit through a line, divides the complementary square - wave signal through resistors, capacitors and MOS transistors to generate a three - stage voltage, and controls the display of the LCD liquid crystal screen.

[0015] Preferably, the complementary square - wave generating circuit includes a first resistor R39, a second resistor R40, a third resistor R22, a fourth resistor R30, a fifth resistor R14, a sixth resistor R54, a first capacitor C4, a second capacitor C6, a first triode Q6, a first MOS transistor Q4 and a second MOS transistor Q8;

[0016] One end of the first resistor R39 and one end of the second resistor R40 form a common terminal connected to the base of the first triode Q6;

[0017] One end of the third resistor R22 and one end of the fourth resistor R30 form a common terminal connected to the collector of the first triode Q6;

[0018] The other end of the fourth resistor R30 and one end of the first capacitor C4 form a common terminal connected to the gate of the first MOS transistor Q4;

[0019] The other end of the second resistor R40, the other end of the first capacitor C4, and the emitter of the first triode Q6 form a common terminal connected to the ground;

[0020] One end of the fifth resistor R14 is connected to the source of the first MOS transistor Q4;

[0021] The other end of the fifth resistor R14 and the other end of the third resistor R22 form a common terminal connected to the power supply;

[0022] One end of the sixth resistor R54 and one end of the second capacitor C6 form a common terminal connected to the gate of the second MOS transistor Q8;

[0023] The drain of the first MOS transistor Q4 is connected to the drain of the second MOS transistor Q8;

[0024] The other end of the second capacitor C6 and the source of the second MOS transistor Q8 form a common terminal connected to the ground.

[0025] Preferably, the first voltage dividing circuit includes a seventh resistor R25, an eighth resistor R15, a ninth resistor R41, a tenth resistor RL2, an eleventh resistor R49, a third capacitor C2, and a third MOS transistor Q3;

[0026] One end of the seventh resistor R25, one end of the eighth resistor R15, and one end of the third capacitor C2 form a common terminal connected to the gate of the third MOS transistor Q3;

[0027] The other end of the third capacitor C2 is grounded;

[0028] The source of the third MOS transistor Q3 and the other end of the eighth resistor R15 form a common terminal connected to the power supply;

[0029] The tenth resistor RL2 and the eleventh resistor R49 form a parallel circuit. One end of the parallel circuit and one end of the ninth resistor R41 form a common terminal connected to the drain of the second MOS transistor Q8, and the other end of the ninth resistor R41 is connected to the drain of the third MOS transistor Q3; the other end of the parallel circuit is connected to the source of the second MOS transistor Q8.

[0030] Preferably, the LCD driving - SEG module includes:

[0031] A second voltage dividing circuit, connected to the I / O port of the main control single - chip microcomputer module, divides the SEG signal from the main control single - chip microcomputer through resistors and capacitors to generate a three - stage voltage, and cooperates with the COM voltage to control the display of the LCD liquid crystal screen.

[0032] Preferably, the second voltage dividing circuit includes a twelfth resistor R1, a thirteenth resistor R3, and a fourth capacitor EC1;

[0033] One end of the twelfth resistor R1 is connected to one end of the thirteenth resistor R3, the other end of the thirteenth resistor R3 is connected to the positive electrode of the fourth capacitor EC1, and the negative electrode of the fourth capacitor EC1 is connected to the ground.

[0034] Preferably, the main control single - chip microcomputer module is a general - purpose single - chip microcomputer, and the number of its I / O ports is expanded and configured according to the number of segments required by the liquid crystal screen.

[0035] Preferably, the voltage values of the LCD driving - COM module and the LCD driving - SEG module are adapted by adjusting the resistance value of the voltage - dividing resistor or the capacitance value of the capacitor.

[0036] Preferably, the backlight driving module provides a constant current or a constant voltage for the LCD liquid crystal screen.

[0037] Preferably, the LCD driving - COM module, the LCD driving - SEG module, the backlight driving module, and the main control single - chip microcomputer module are connected through FPC terminals.

[0038] The beneficial technical effects brought by the present invention:

[0039] The I / O resources of the single-chip microcomputer driving the liquid crystal display screen in the present invention are not restricted; according to different screens, the same circuit can be used for driving, and by matching single-chip microcomputers with different pins, the use of single-chip microcomputer resources is more flexible; it can get rid of the restriction of only being able to use a single-chip microcomputer with LCD driving function; the single-chip microcomputer is more free and can use a single-chip microcomputer with more functional peripherals; the control is more accurate, especially when driving a multi-segment liquid crystal display screen, and the display driving algorithm is simpler than that driven by multiple single-chip microcomputers; the driving voltages of SEG and COM can be changed through the peripheral circuit. Description of the Drawings

[0040] Figure 1 It is a schematic circuit diagram of the hardware driving circuit for a multi-segment LCD liquid crystal display screen;

[0041] Figure 2 It is a schematic circuit diagram of the LCD driving - COM1 module;

[0042] Figure 3 It is a schematic circuit diagram of the LCD driving - COM2 module;

[0043] Figure 4 It is a schematic circuit diagram of the LCD driving - COM3 module;

[0044] Figure 5 It is a schematic circuit diagram of the LCD driving - COM4 module;

[0045] Figure 6 It is a schematic circuit diagram of the backlight driving module;

[0046] Figure 7 It is a schematic diagram of the main control single-chip microcomputer module. Detailed Embodiment

[0047] The present invention will be further described in detail below in conjunction with the drawings and the specific embodiments:

[0048] The working principle of the hardware driving circuit for the multi-segment LCD liquid crystal display screen is as follows:

[0049] Signal source:

[0050] The main control single-chip microcomputer (MCU) does not have the LCD driving function, but generates the SEG signal and COM signal required for driving the LCD liquid crystal display screen through its I / O ports. These signals are usually digital square wave signals used to control the display state of the liquid crystal display screen.

[0051] COM signal processing:

[0052] The COM signal from the MCU is sent to the LCD driving - COM module.

[0053] Complementary square wave generation circuit: A complementary square wave is generated in the COM module, for example, by switching the transistors or MOS transistors to generate two square wave signals with opposite phases.

[0054] Voltage division circuit: The complementary square wave is divided by a voltage division circuit (composed of resistors, capacitors, MOS transistors, etc.) to generate a three-stage COM voltage. These three voltages are VCC, ground, and the intermediate voltage, which are used to control the voltage of the common terminal (COM) of the LCD liquid crystal screen.

[0055] SEG signal processing:

[0056] The SEG signal from the MCU is sent to the LCD driver - SEG module.

[0057] Voltage division circuit: The voltage division circuit (composed of resistors, capacitors, etc.) in the SEG module divides the SEG signal to generate a three-stage SEG voltage (VCC, ground, and the intermediate voltage).

[0058] LCD driving:

[0059] Each segment of the LCD liquid crystal screen is controlled by a COM terminal and a SEG terminal.

[0060] By controlling the voltage difference between the COM terminal and the SEG terminal, the rotation of the liquid crystal molecules can be controlled, thereby controlling the display state of this segment. When the voltage difference between COM and SEG is large enough (greater than the saturation voltage), the liquid crystal molecules rotate and this segment is displayed; when the voltage difference is small or zero (less than the threshold voltage), the liquid crystal molecules do not rotate and this segment is not displayed.

[0061] Since the COM and SEG voltages are generated by an external hardware circuit, a common single-chip microcomputer without an LCD driver can be selected as the main controller, thus liberating the limitation of the single-chip microcomputer selection and enabling the use of more peripheral functions of the single-chip microcomputer.

[0062] By adjusting the parameters of the external circuit (such as the resistance value), the driving voltages of SEG and COM can be changed to adapt to different specifications of LCD liquid crystal screens.

[0063] As Figure 1 shown, a hardware driving circuit for a multi-segment LCD liquid crystal screen includes:

[0064] The main control single-chip microcomputer module (as Figure 7 shown) is configured to output SEG signals and COM signals for driving the LCD liquid crystal screen;

[0065] The LCD driving - COM module is connected to the I / O port of the main control MCU module and is configured to convert the COM signal output by the MCU into the COM segment voltage required to drive the LCD liquid crystal screen through resistors, capacitors, and MOS transistors, and output it to the COM terminal of the liquid crystal screen;

[0066] The LCD driving - SEG module is connected to the I / O port of the main control MCU module and is configured to convert the SEG signal output by the MCU into the SEG segment voltage required to drive the LCD liquid crystal screen through resistors and capacitors, and output it to the SEG terminal of the liquid crystal screen;

[0067] The backlight driving module provides the backlight power supply for the LCD liquid crystal screen;

[0068] Among them, the LCD driving - COM module and the SEG driving module generate the voltage difference required for the LCD liquid crystal screen through their respective voltage - dividing circuits, and control the rotation of the LCD liquid crystal screen to achieve display.

[0069] The LCD driving - COM module includes (as Figures 2 - 5 shown):

[0070] The complementary square - wave generating circuit is configured to receive the complementary square - wave signal from the main control MCU module;

[0071] The first voltage - dividing circuit is connected to the complementary square - wave generating circuit through a line, divides the complementary square - wave signal through resistors, capacitors, and MOS transistors to generate a three - stage voltage, and controls the display of the LCD liquid crystal screen.

[0072] The complementary square - wave generating circuit includes a first resistor R39, a second resistor R40, a third resistor R22, a fourth resistor R30, a fifth resistor R14, a sixth resistor R54, a first capacitor C4, a second capacitor C6, a first triode Q6, a first MOS transistor Q4, and a second MOS transistor Q8;

[0073] One end of the first resistor R39 and one end of the second resistor R40 form a common terminal connected to the base of the first triode Q6;

[0074] One end of the third resistor R22 and one end of the fourth resistor R30 form a common terminal connected to the collector of the first triode Q6;

[0075] The other end of the fourth resistor R30 and one end of the first capacitor C4 form a common terminal connected to the gate of the first MOS transistor Q4;

[0076] The other end of the second resistor R40, the other end of the first capacitor C4, and the emitter of the first triode Q6 form a common terminal connected to the ground;

[0077] One end of the fifth resistor R14 is connected to the source of the first MOS transistor Q4;

[0078] The other end of the fifth resistor R14 and the other end of the third resistor R22 form a common terminal connected to the power supply;

[0079] One end of the sixth resistor R54 and one end of the second capacitor C6 form a common terminal connected to the gate of the second MOS transistor Q8;

[0080] The drain of the first MOS transistor Q4 is connected to the drain of the second MOS transistor Q8;

[0081] The other end of the second capacitor C6 and the source of the second MOS transistor Q8 form a common terminal connected to ground.

[0082] The first voltage dividing circuit includes a seventh resistor R25, an eighth resistor R15, a ninth resistor R41, a tenth resistor RL2, an eleventh resistor R49, a third capacitor C2, and a third MOS transistor Q3;

[0083] One end of the seventh resistor R25, one end of the eighth resistor R15, and one end of the third capacitor C2 form a common terminal connected to the gate of the third MOS transistor Q3;

[0084] The other end of the third capacitor C2 is grounded;

[0085] The source of the third MOS transistor Q3 and the other end of the eighth resistor R15 form a common terminal connected to the power supply;

[0086] The tenth resistor RL2 and the eleventh resistor R49 form a parallel circuit. One end of the parallel circuit and one end of the ninth resistor R41 form a common terminal connected to the drain of the second MOS transistor Q8, and the other end of the ninth resistor R41 is connected to the drain of the third MOS transistor Q3; the other end of the parallel circuit is connected to the source of the second MOS transistor Q8.

[0087] The LCD driving - SEG module includes:

[0088] The second voltage dividing circuit is connected to the I / O port of the main control single - chip microcomputer module, divides the SEG signal from the main control single - chip microcomputer through resistors and capacitors to generate a three - stage voltage, and cooperates with the COM voltage to control the display of the LCD liquid crystal screen.

[0089] The second voltage dividing circuit is connected to the I / O port of the main control single - chip microcomputer module, divides the SEG signal from the main control single - chip microcomputer through resistors and capacitors to generate a three - stage voltage, and cooperates with the COM voltage to control the display of the LCD liquid crystal screen.

[0090] The main control single - chip microcomputer module is a general - purpose single - chip microcomputer, and the number of its I / O ports is configured according to the segment number requirement of the liquid crystal screen.

[0091] The voltage values of the LCD driver - COM module and the LCD driver - SEG module are adapted by adjusting the resistance value of the voltage - dividing resistor or the capacitance value of the capacitor.

[0092] The backlight driver module provides a constant current or a constant voltage for the LCD liquid crystal display.

[0093] The LCD driver - COM module, the LCD driver - SEG module, the backlight driver module, and the main control MCU module are connected through FPC terminals.

[0094] The specific content is as follows:

[0095] (1) COM module - Module 1

[0096] The I / O - 1 port of the MCU is connected to the left side of resistor R39. The right side of resistor R39 is connected to the upper side of R49. Transistor Q6 is connected, and the lower side of resistor R49 is connected to the power ground. The upper side of resistor R40, the upper side of transistor Q6 is connected to the lower side of resistor R22. The upper side of resistor R22 is connected to power VCC. The lower side of Q6 is connected to the power ground. The upper side of transistor Q6 is connected to the left side of resistor R30. The right side of resistor R30 is connected to the upper side of capacitor C4. The lower side of C4 is connected to the power ground. The right side of resistor R30 is connected to MOS transistor Q4. The upper side of Q4 is connected to the lower side of resistor R14. The upper side of R14 is connected to power VCC. The lower side of Q4 is connected to the upper side of MOS transistor Q8. The I / O - 2 of the MCU is connected to the left side of resistor R54. The right side of R54 is connected to the upper side of capacitor C6. The lower side of capacitor C6 is connected to the power ground. The right side of R54 is connected to MOS transistor Q8. The lower side of MOS transistor Q8 is connected to the power ground. The I / O - 1 port of the MCU is connected to the right side of resistor R25. The left side of resistor R25 is connected to the upper side of C22. The lower side of C22 is connected to the power ground. The left side of resistor R25 is connected to the lower side of resistor R15. The upper side of resistor R15 is connected to the power ground. The left side of resistor R25 is connected to MOS transistor Q3. The upper side of Q3 is connected to power VCC. The lower side of Q3 is connected to the upper side of resistor R41. The lower side of resistor R41 is connected to resistor RL2, the upper side of resistor R49, resistor RL2, and the lower side of resistor R49 are connected to the power ground.

[0097] The LCD driving voltage is output from the COM1 network

[0098] Complementary square waves are output through I / O - 1 and I / 0 - 2, and a three - stage voltage is generated by voltage division through MOS transistors and resistors. It cooperates with the SEG voltage to control the display of the liquid crystal display.

[0099] COM modules 2, 3, and 4 are the same as COM module 1

[0100] (2) SEG module

[0101] The I / O-3 port of the single-chip microcomputer is connected to the left side of the resistor R1. The right side of the resistor R1 is connected to the left side of R3, and the right side of R3 is connected to the upper side of the capacitor EC1. The lower side of the capacitor EC1 is connected to the power ground.

[0102] Through the voltage division of the resistor and capacitor, the SEG network outputs a three-stage voltage to cooperate with the SEG voltage to control the display of the liquid crystal screen.

[0103] The above is the single SEG drive, and the multiple SEG drives are the same.

[0104] (3) The backlight drive module includes (as Figure 6 shown):

[0105] The power input terminal (VIN), overvoltage protection circuit (OVP), enable control terminal (EN), voltage stabilizing capacitors (C13 - C16) and MOS transistor switch;

[0106] The backlight voltage is adjusted through the voltage dividing resistors (R134, R135) and the diode (D1) to provide a stable backlight power supply for the liquid crystal screen.

[0107] Of course, the above description is not a limitation of the present invention, and the present invention is not limited to the above examples. Changes, modifications, additions or substitutions made by those skilled in the art within the scope of the essence of the present invention should also fall within the protection scope of the present invention.

Claims

1. A hardware drive circuit for a multi-segment LCD liquid crystal screen, characterized in that, Comprising: A main control single-chip microcomputer module configured to output SEG signals and COM signals for driving an LCD liquid crystal display screen; An LCD drive-COM module connected to the I / O port of the main control single-chip microcomputer module, configured to convert the COM signal output by the single-chip microcomputer into a COM segment voltage required for driving the LCD liquid crystal display screen through resistors, capacitors and MOS transistors, and output it to the COM terminal of the liquid crystal display screen; An LCD drive-SEG module connected to the I / O port of the main control single-chip microcomputer module, configured to convert the SEG signal output by the single-chip microcomputer into a SEG segment voltage required for driving the LCD liquid crystal display screen through resistors and capacitors, and output it to the SEG terminal of the liquid crystal display screen; A backlight drive module that provides a backlight power supply for the LCD liquid crystal display screen; Wherein, the LCD drive-COM module and the SEG drive module generate a voltage difference required for the LCD liquid crystal display screen through their respective voltage dividing circuits, and control the rotation of the LCD liquid crystal display screen to achieve display.

2. The hardware drive circuit of the multi-segment LCD liquid crystal screen according to claim 1, wherein The LCD drive-COM module includes: A complementary square wave generation circuit configured to receive a complementary square wave signal from the main control single-chip microcomputer module; A first voltage dividing circuit connected to the complementary square wave generation circuit through a line, and divides the complementary square wave signal through resistors, capacitors and MOS transistors to generate a three-stage voltage to control the display of the LCD liquid crystal display screen.

3. The hardware drive circuit of a multi-segment LCD liquid crystal display screen according to claim 2, wherein The complementary square wave generation circuit includes a first resistor R39, a second resistor R40, a third resistor R22, a fourth resistor R30, a fifth resistor R14, a sixth resistor R54, a first capacitor C4, a second capacitor C6, a first triode Q6, a first MOS transistor Q4 and a second MOS transistor Q8; One end of the first resistor R39 and one end of the second resistor R40 form a common terminal connected to the base of the first triode Q6; One end of the third resistor R22 and one end of the fourth resistor R30 form a common terminal connected to the collector of the first triode Q6; The other end of the fourth resistor R30 and one end of the first capacitor C4 form a common terminal connected to the gate of the first MOS transistor Q4; The other end of the second resistor R40, the other end of the first capacitor C4 and the emitter of the first triode Q6 form a common terminal connected to the ground; One end of the fifth resistor R14 is connected to the source of the first MOS transistor Q4; The other end of the fifth resistor R14 and the other end of the third resistor R22 form a common terminal connected to the power supply; One end of the sixth resistor R54 and one end of the second capacitor C6 form a common terminal connected to the gate of the second MOS transistor Q8; The drain of the first MOS transistor Q4 is connected to the drain of the second MOS transistor Q8; The other end of the second capacitor C6 and the source of the second MOS transistor Q8 form a common terminal connected to the ground.

4. The hardware drive circuit of a multi-segment LCD liquid crystal display screen according to claim 2, wherein The first voltage dividing circuit includes a seventh resistor R25, an eighth resistor R15, a ninth resistor R41, a tenth resistor RL2, an eleventh resistor R49, a third capacitor C2 and a third MOS transistor Q3; One end of the seventh resistor R25, one end of the eighth resistor R15, and one end of the third capacitor C2 form a common terminal and are connected to the gate of the third MOS transistor Q3; The other end of the third capacitor C2 is grounded; The source of the third MOS transistor Q3 and the other end of the eighth resistor R15 form a common terminal and are connected to the power supply; The tenth resistor RL2 and the eleventh resistor R49 form a parallel circuit. One end of the parallel circuit and one end of the ninth resistor R41 form a common terminal and are connected to the drain of the second MOS transistor Q8. The other end of the ninth resistor R41 is connected to the drain of the third MOS transistor Q3. The other end of the parallel circuit is connected to the source of the second MOS transistor Q8.

5. The hardware drive circuit of the multi-stage LCD liquid crystal screen according to claim 1, characterized in that, The LCD driving - SEG module includes: A second voltage - dividing circuit, connected to the I / O port of the main control single - chip microcomputer module, divides the SEG signal from the main control single - chip microcomputer through resistors and capacitors to generate a three - stage voltage, and cooperates with the COM voltage to control the display of the LCD liquid crystal screen.

6. The hardware driving circuit of the multi - segment LCD liquid crystal screen according to claim 5, wherein, The second voltage - dividing circuit includes a twelfth resistor R1, a thirteenth resistor R3, and a fourth capacitor EC1; One end of the twelfth resistor R1 is connected to one end of the thirteenth resistor R3. The other end of the thirteenth resistor R3 is connected to the positive electrode of the fourth capacitor EC1. The negative electrode of the fourth capacitor EC1 is connected to the ground.

7. The hardware driving circuit of the multi-stage LCD liquid crystal screen according to claim 1, characterized in that, The main control single - chip microcomputer module is a general - purpose single - chip microcomputer, and the number of its I / O ports is configured by expanding according to the segment number requirement of the liquid crystal screen.

8. The hardware driving circuit of the multi-segment LCD liquid crystal screen according to claim 1, characterized in that, The voltage values of the LCD driving - COM module and the LCD driving - SEG module are adapted by adjusting the resistance value of the voltage - dividing resistor or the capacitance value of the capacitor.

9. The hardware drive circuit of the multi-stage LCD liquid crystal screen according to claim 1, characterized in that, The backlight driving module provides a constant current or a constant voltage for the LCD liquid crystal screen.

10. The hardware drive circuit of the multi-segment LCD liquid crystal screen according to claim 1, characterized in that, The LCD driving - COM module, the LCD driving - SEG module, the backlight driving module, and the main control single - chip microcomputer module are connected through FPC terminals.

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